首页
登录
职称英语
Most of-us are used to seasons. Each year, spring follows winter, which fol
Most of-us are used to seasons. Each year, spring follows winter, which fol
游客
2025-03-14
0
管理
问题
Most of-us are used to seasons. Each year, spring follows winter, which follows au-tumn, which follows summer, which follows spring. And winter is colder than summer.But the earth goes through temperature cycles over much longer periods than those that we experience. Between 65,000 and 35,000 years ago, the planet was much colder than it is now. During that time the temperature also changed a lot, with periods of warming and cooling. Ice melted during the warm periods, which made sea levels rise. Water froze again during the cold periods.
A new study from Switzerland sheds light on where ice sheets melted during the ice age.
It now seems that the ice melted at both ends of the earth, rather than just in ei-ther northern or southern regions.
This surprised the researchers from the University of Bern.
Scientists have long assumed that most of the ice that melted was in the Northern hemisphere (半球) during the 30,000-year long ice age.
That belief was held because the North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. It is easier for ice sheets to grow on land. If surrounded by sea the ice can easily just slip into the ocean instead of building up.
The researchers used a computer model to look at ways the ice could melt and how it might affect sea levels. They compared these results to evidence of how temperatures and currents actually changed during that time. The model showed that if it was only in the Northern hemisphere that ice melted, there would have been a bigger impact (影响) on ocean currents (洋流) and sea temperatures than what actually happened. Studies suggest that melting just in the Southern hemisphere would have been impossible, too. The only reasonable conclusion, the scientists could make, was that ice melted equally in the North and the South.
It is still a mystery as to what caused the temperature changes that caused the ice to melt. [br] The North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. So scientists thought that ______.
选项
A、most of the ice melted in the Northern hemisphere
B、most of the ice melted in the Southern hemisphere
C、The North Pole is colder than the South Pole
D、The South Pole is colder than the North Pole
答案
A
解析
事实细节题。根据第三段第二、三句Scientists have long assumed that most of the ice that melted
转载请注明原文地址:https://tihaiku.com/zcyy/3997401.html
相关试题推荐
Mr.Andersonusedto(jogging)inthe(earlymorning)air(during)(thewinterm
Theywillgohomeforwintervacationassoonasthey______theirexams.A、have
Thepriceofoil______from$15to$18pertankduringthewinterseason.A、rang
【B1】[br]【B3】A、infollowB、infollowingC、asfollowsD、asfollowingCasfollows
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
InwintertheremaybeseveralfeetofsnowinotherpartsofEnglandbutthere
Shelooksforwardeveryspringto______theflower-linedgarden.A、walkinginB、
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
随机试题
流脑的发病高峰在哪些月份A.5~6月 B.1~2月 C.7~8月 D.3~
可引起温室效应的主要物质是A.SO B.CO C.CO D.NO E.N
十二经脉的别络都是从A、头面部分出 B、四肢肘膝以下分出 C、四肢肘膝以上分
从1998到2003年中,下面分析正确的是:A.每年的“科研基建费”比“其
确定项目投资营业现金流量所必须考虑的因素有()A.非付现成本 B.
干渴:茶杯A.饥饿:面包 B.寒冷:衣柜 C.思恋:短信 D.贫穷:财富
单一资产管理计划接受接受投资者合法持有的股票、债券或中国证监会认可的其他金融资产
系统脱敏法起源于()。 (A)系统论的基本观点(B)精神病人的临床实
乳牙龋病的治疗目的不会是A.终止龋蚀的发展 B.保护根髓的正常活力 C.恢复
甲公司以出让方式取得一块土地的建设用地使用权,使用期限为50年。根据物权法律制度
最新回复
(
0
)